D. Why was the walk by the river special?

Решение:

В тексте говорится: "In the evening, we took a walk along the river and watched the city lights reflecting on the water. It was such a peaceful moment." Описание "city lights reflecting on the water" указывает на причину, по которой прогулка была особенной.

Ответ: 2. The city lights reflected on the water